Yes, you can, but first they must be converted into Folder HelpDesktickets:
Copy the e-mails to a new public folder or shared mailbox
(Set permissions so that only the evaluators can access that new folder)
Install Folder HelpDesk into a new (another) public folder or shared mailbox under the one just created
Set up auto-conversion so that all the emails get converted into tickets (refer to manual)
Update categorization on all tickets
Close tickets that are based on e-mails that have been handled
Run the Excel reports application by pressing the statistics button in the Folder HelpDesk Outlook toolbar